Malicious PDF — malware analysis report

Static analysis result for SHA-256 e89e4b5af9cbc015…

MALICIOUS

PDF

74.2 KB Created: 2021-06-20 06:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 5fd2b2c876827a8de4a40b13225f776f SHA-1: c12690961b780fd504797d255884bde78e7e11b0 SHA-256: e89e4b5af9cbc015421bda2747c3205581ea319a7c0a1b45b6f3a46380a62b80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to distribute malware. The presence of a ML classifier flagging it as malicious and ClamAV detection further supports this. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings indicate an attempt to trick users into downloading software, likely leading to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://buddhavehicle.com/userfiles/file/sopur.pdf In PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160908da66420b---darirasezakukopekepuganob.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/ffd36e91242ee339b82d1116d32e0c9d/92151615853.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc325b45cff---35040849008.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/5b63893920a983d1a0913d1f9ae7d720/37912185957.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c6a531d88---38844571608.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e235e445432b640927f3d5fd3bb28dfb/46207863505.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/06793a215ebd34de3dcc0c548e3da3c3/81613514404.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/4htqb384h7irnrp2ev4gp0p4k4/3665523717.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/kiwajatoxof.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/d25cd4895bb018a15ee03f794c6d1bcc/lerugolizisefu.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/lalarivizifixamamig.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/fedevediwuwuxe.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/gasum.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/puzigasexonogevobu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=download+dumpper+and+jumpstart+for+windows+7PDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d8494a4ec---56771547465.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE649 5432 bytes
SHA-256: 7d55a34dd4dab718e1758f697fce2fd158d37a5075e2dec38b26c5c65f90381c
font_01_sfnt_off0000f8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CF 10296 bytes
SHA-256: 757ddf51cb48762f3fe1b414d4b7908fbf97ee760cabb4393c3547493492e50e